Effects of positron density and temperature on ion-acoustic solitary waves in a magnetized electron-positron-ion plasma: Oblique propagation

2009 ◽  
Vol 16 (5) ◽  
pp. 052309 ◽  
Author(s):  
A. Esfandyari-Kalejahi ◽  
M. Mehdipoor ◽  
M. Akbari-Moghanjoughi
Keyword(s):  
Solitary Waves ◽  
Oblique Propagation ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Acoustic Solitary Waves ◽  
Ion Acoustic

Head-on collision of ion acoustic solitary waves in an electron-positron-ion plasma with superthermal electrons

2010 ◽  
Vol 17 (12) ◽  
pp. 122314 ◽  
Author(s):  
Prasanta Chatterjee ◽  
Uday narayan Ghosh ◽  
Kaushik Roy ◽  
S. V. Muniandy ◽  
C. S. Wong ◽  
...  
Keyword(s):  
Solitary Waves ◽  
Superthermal Electrons ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Acoustic Solitary Waves ◽  
Ion Acoustic

Nonlinear structure of ion-acoustic solitary waves in a relativistic degenerate electron–positron–ion plasma

2011 ◽  
Vol 78 (2) ◽  
pp. 133-141 ◽  
Author(s):  
A. RASHEED ◽  
N. L. TSINTSADZE ◽  
G. MURTAZA ◽  
R. CHAUDHARY
Keyword(s):  
Solitary Waves ◽  
Acoustic Waves ◽  
Number Range ◽  
Thomas Fermi ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Acoustic Solitary Waves ◽  
Ion Acoustic ◽  
Arbitrary Amplitude ◽  
Pseudo Potential

AbstractArbitrary amplitude and small amplitude ion-acoustic solitary waves (IASWs) have been investigated in a relativistic, collisionless, unmagnetized, and degenerate dense electron–positron–ion plasma. The arbitrary amplitude IASWs have been studied by using the Sagdeev-type pseudo-potential approach. Along with approximate solution, the exact amplitude solitary structure has also been studied numerically. The electrons and positrons are assumed to follow the corresponding Fermi distribution function and the ions are described by the hydrodynamic equations. A new dispersion relation for the ion-acoustic wave has been derived for the relativistic Thomas–Fermi plasma. An energy balance-like equation involving the Sagdeev-type pseudo-potential has been investigated and it has been shown that the concentration of plasma particles has significant effect on the permitted Mach number range of IASWs. Also, it has been pointed out that the only compressional supersonic IASWs can propagate in the relativistic Thomas–Fermi plasma. The present work would be helpful to understand the excitation of the nonlinear ion-acoustic waves in a degenerate plasma, such as in superdense white dwarfs and in the cores of massive planets.

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